AD5220BRM100

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Data acquisition is the measurement of physical quantities and the subsequent storing, analyzing, and displaying of the data for engineering and operational purposes. Digital potentiometers, in particular, can provide a way to control analog and digital circuit applications with precision. The AD5220BRM100 from Analog Devices is a digitally controllable potentiometer tailored for this purpose. This article will explore the application field and working principle of the device.

The AD5220BRM100 digital potentiometer is an integrated circuit (IC) composed of a voltage divider network, a 10-bit, volatile register and an integrated nonvolatile EEPROM memory. This single IC can be used to set up one potentiometer over a wide resistance range, with a total adjustable resistance of 20K Ω. This digital potentiometer is composed of three terminals – Input, Output, and Control. All three pins need to be connected properly in order to work correctly. The device runs on a single voltage supply which can be either 3 V or 5 V, making it suitable for use on portable battery-operated designs.

The AD5220BRM100 digital potentiometer can be used for a variety of applications. It is suitable for voltage controlled current and voltage controlled resistance applications, such as controlling the gain of amplifiers, controlling the supply voltage in switched-mode power supplies, controlling the dc/dc converters, and controlling the brightness of LED displays. It can also be used to provide adjustable threshold levels for comparators and set the periodic interval for counters and timers.

The working principle of the AD5220BRM100 digital potentiometer is relatively simple. The wiper position of the potentiometer is set by applying a 10-bit digital code on the control pins which is stored in the nonvolatile EEPROM memory. This code determines the resistance ratio between the input pin and output pin. Both the position and resistance ratio of the digital potentiometer can be adjusted by updating the contents of the EEPROM memory.

Apart from the standard features of the device, there are features that make the AD5220BRM100 stand out when compared to traditional potentiometers. Digital potentiometers are non-volatile, meaning the settings can be stored and the device maintained in a powered-off state without changing the resistance ratio. These devices also increase reliability, reduce the number of components used, and can be calibrated externally for higher accuracy.

In conclusion, the AD5220BRM100 digital potentiometer from Analog Devices is a reliable, precise, and cost effective solution for a variety of application needs. The device provides a wide adjustable resistance range of 20K Ω and is designed for use with 3 V and 5 V single voltage supply systems. It is an ideal choice for application areas such as voltage controlled resistance and current applications, adjustable threshold level requirements, and setting periodic intervals.

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